sze, have you spoken with the service manager? I know you spoke with 'someone' at the dealership, but unless you speak to the actual service department manager then you may be wasting your time at the dealership.
Keep in mind that I have never encountered a dealership service department not willing to perform warranty work. Its easy money for them as they aren't charging the customer for business they need. If the situation lies in a gray area then the sales manager can engage the regional manager and see if it can be comp'd as 'doing the right thing'.
I had a steering rack fail on a 2001 Tundra less than 10K outside of the 36K mile warranty. Steering racks are not powertrain. It was a rare instance that would have cost me $600 in 2004 for a rebuilt one put in with no warranty by a local garage, or $1300 by the dealership which came with the 12-month/12K warranty.
The sales manager spoke with the regional and met me half way and it cost me $550. While the steering rack that is in the truck has worked flawlessly ever since (put another 100K miles on it since), it was an unusual issue. Sales managers can be your friend, or just be representative of a dickhead dealership.
BTW, the first time an O2 sensor failed on my Tundra it was under warranty. But they couldn't get the pre-cat fucker out of the exhaust manifold. They replaced the sensor and manifold on the manufacture's dime. LOL I late learned the sensor, made by someone other than Toyota, had a design fault and a nation-wide recall took place.
Ask to speak to the service department's service manager and ask him to engage the regional manager on your behalf. Be polite, but also tell them at this point you are not likely to buy Mitsu again and would be more likely, upon a negative result, to bad mouth Mitsu in your day to day affairs with the general public.
The service manager I spoke to at the dealership close to my house kept telling me only cat, emc, fuel pumps, etc are the ones on the Cali model like mine that are covered under 80k/7 year warranty.
So I asked if the sensor, since they work in conjunction with the other emissions parts are also covered and he told me no those are under the 60k/ 5 year warranty since they did not have an astriks next to them in the warranty booklet.
I then stated so if my catalyct converter goes bad, then the o2 sensor as well as the cat would be covered under the extra warranty. He says yes, then a long silence. Which does not make any sense.
So I tried a dealer near my work and they gave me the same speal. This is what the warranty booklet states, if the code only states it's a sensor and not a covered emissions part, then the sensors are excluded.
After work I got in my car, turned it on and to my suprise no more service engine light. I didn't reset it earlier as I was planning to take it to my mechanic right after work and tell him I found the part online.
Drove home about 30 miles and drove some more tonite after taking my motorcycle out for a small tour around the city, and still no more engine light.
Weird...either the light is a false alarm or I don't know what happened. I never noticed my mpg go lower or any weird behaviour. I guess I'll wait it out. This gives me time hopefully to finish my dental work and take care of my medical bills assuming the light or the same code does not come back.
Very strange, I've never had a check engine light that spit out an actual code go away on its own.
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